sdma_block2.asv

无线多址技术SDMA的MATLAB仿真及其相关知识讲解！！！！

text_num=10000;%%%%the text num。
channelnum=10;  %%%the num  of   channel
block_num=0;%%%用the num which is blocking
p1=0;    %%%to catch the probability of the blocking instance
ps=0.99;  %%%the probability of successful spatial allocation
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   for  A=1:8
       lambda1=20; 
       lambda2=A/20;
       ichnum=0;
       qchnum=0;
       block_num=0;
       n=0;
    for i=1:text_num; 
        if ichnum<=channelnum;     
      %%%%%%%%%%%%%  
    if(ichnum==channelnum && qchnum==channelnum)
           block_num=block_num+1;
            ichnum=0;
           qchnum=0;

       end;
      %%%%%%%%%%%%%% 
        comeint(i)=exprnd(lambda1);
        sevint(i)=exprnd( 1/lambda2);
      for j=1:i;
         ltime(j)=sevint(j)-comeint(i);
       if  ltime(j)<=0
           if ichnum>qchnum
           ichnum=ichnum-1;
           if ichnum<0;
               ichnum=0;
           else if ichnum==qchnum
               qchnum=qchnum-1;
               if qchnum<0;
               qchnum=0;
       end
               end  
           end
           end
       end
      end
      %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        if  comeint(i)>sevint(i) 
              temp=rand; 
           if ichnum>qchnum && temp<ps                      
                  qchnum=qchnum+1;
           else    ichnum=ichnum+1;
            end
        end   
    else   block_num=block_num+1;
          ichnum=0;
          qchnum=0;
end;
end;
p1(A)=block_num/(n+text_num);
end;
SNRindB1=1:8;
semilogy(SNRindB1,p1,'*');